Different wish-list item: In the 'Features' facet there are features that enable the querying and filtering for previewed and opened items. How about including similar features just that they work on the previewed/opened items as well as the items' duplicates? This would be similar to the tagging option that allows for tagging all the duplicates of an item at the same time. As an alternative/variant the query could also pull all the duplicates, excluding the primary item.
In fact, if there was a generic way to do this for query and filter elements in the left column, this function could be provided for a set of features including Tagged, Flagged, Commented, Previewed, Opened, Exported, Redacted, all the tags created and all locations. Just food for thought. It would save quite a few manual queries using MD5 that are usually not well understood/appreciated by reviewers.